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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e8904db61054cc2698e9d8a7cca6eb593e04fe4d43f0cc37bfde7be7e87c917' 
  AND token = 'wjiR3SQ/oPqytvfxgrgpPKrHH9l64pENwzJhMvMPDLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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