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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e7735c7c3d6d9da092b67a931d7574b5bf5a6e7deeca2ca6901bf2e41b4c7f' 
  AND token = '0V6gDRCGoMfJS0vLEQ9FdlaDg9tdrf+ILfV2864YJRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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