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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f84254140c58fca91179f0b180ab31ed0b92c232af10d3b3b36aee8677cbd6' 
  AND token = 'LrDAVh7kfkwo5flspMsUB0icl6LbHR0sPcEfecjABkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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