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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c63fa6c9ef2c98922b4fb7b26d9450d2f67618da81ac50990d9996c24bc37519' 
  AND token = 'qibeqFtaYkIueON79GmTppnqC3tjG4tjGWgExVL5SnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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