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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b69b8c02488ff898bca247abd3f164e9e0900702d2b783a4e0e2736436e1b3' 
  AND token = 'Hq44vtcrAxs8iQteHI+Ws0PY4oabg4WuND5d6LX1/+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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