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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e3c40533abad7a4649586f506503348570911156506a6da936d69b2a683d5dd' 
  AND token = 'sOPFgELrd4kpYo7x5EgYzY3oyjV5ucXKfZuIm2vmD5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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