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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d460778fbc86476c7740a0fde7b6e9eeb2c4822dc4aef68e9ac2fb4698c230' 
  AND token = 'hqip1mhysYiKduvC1qmqWOVvBoYGBBJiKL1JAmdyfQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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