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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3773dd55b81c92ae55860ffa6b0ccb6a988f840545248eac2ee0539f4f5db4' 
  AND token = 'S3SM0zfDQTz7EyTlEuph51cQ8S8o3BmlqeNsLGqbr9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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