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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb8e7ae02e96287033e9682a3a6021e1ab70d622cefc85db7af3d46ce9d9fb5' 
  AND token = 'GkzoxM/WlzfKfENtfeFiey20b5rNtviyx7F3olfmvRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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