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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f27ecf3a692d9c6aba552f7115af8039f4930bb9e61396a18d274746f33d9238' 
  AND token = 'bydkyIFJQP8BdHHzsIZm4ScEZo8vUXysnTwwSPd1whM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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