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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5462d6944c719c4fd60adf92c5ba2bc5b5e4e784aa2fad8cc3453489db4370c3' 
  AND token = 'LB49rqFr1TszByuGn7HLgdkgwNl+gK9fYIsmX6yTqeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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