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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8658d35562459e616dd05126623b2aa14db0c2caf497b942710c9dfcab7d744' 
  AND token = 'AbD9+QMZ5qjtZ6ZDQRqY77ieNMUSb4ZMssPllaohDgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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