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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69902afececc98a39fabf5b931152a65823166b7c6e1896a128dd98275cb307' 
  AND token = 'gZs+tAR4UVy1egb0U4bqlIkoZlaeHlV5R98Ykex9cic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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