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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b9e1e1064635a99659c57de55081310779d88190280758e40c9b130c4301b79' 
  AND token = '8q9mko/72tLGymFfKqT8q4x0IoXVZlQ0oy8HrC7aQmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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