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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ad5e2e3aa4cc9137e7e164e271a2b3890f66c06cf1fea851346925bebd84e33' 
  AND token = '8r/4BYExaH/M7gfYT1n4A33u7sP/hqDRDYxRCjR3Wro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}