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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac9665608ffcc147825aac677ff1347e6ea7e03c5e127c9b135b075d2824454' 
  AND token = 'rb2A5iyfJmjmNhIzSH7iLj3AlvBqix+OD440sudcKh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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