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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7f0bebc0f1cc08dad05fd5504244406bc93217d9bc377d72784504a2dff294' 
  AND token = 'h3+6y2oL/fuxNw8iIrd0bCJBaMMWf5GB/aLDzeBTE6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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