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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '071e38a4b927314339fd3f71530769a941c602448b5ba04b529486e8e2d06f02' 
  AND token = '1atETXtt99WRcE0pjf7oLUr7e6gHJUVRcz9/tNwk3Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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