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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c74d8837f733d807d5762ac94d7399bd16975991ab916ca810d8a134f360ee83' 
  AND token = 'SCUw8CDAlLqGCMfDZ0Dl80jcdPCHFQWtCJ01eitSmv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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