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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6cd13c30ca30a66fdfe12bfae53c38ed271ee5fd172a60c11f69e53510ae1f1' 
  AND token = 'I3LK7qPCvO/tlm+i8Ikf0A4mTEnyqtuHxf29PqPxqVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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