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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48ffb7b1a1600dfc348fcea4dafdb38b1e3fcc3bb9ca80665dd7ed5952be7e6a' 
  AND token = 'cNtLHFyWjEyx9/EDt7ci7y3nALS6Zcl2BYV4/web+yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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