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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c75287108af993b5b42d37007e9263e01cc25e1538e5e5d377d0b0071b7011' 
  AND token = '1DJrDRN91P9iKm9fJaapPzHe9pyoqo1Z5fqZoT6utik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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