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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41a5801e64320e98ae278e64677db41b80040565af70491232476a45739cc631' 
  AND token = 'dLkSBqnhRrfBWVmow5y63N4Mw39V0xj/QXCKCr4Ki+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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