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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe2c9c47d953b6174531a7ca4e9fd60930d7117417a669029048735ed6dee0f' 
  AND token = '88zgipimyTW1vJUo2Re/AltDIx+ASHPm6r0XsZeLMiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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