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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dbef75d53e4ad7371ae524437d99850276cd4232e5592401508bf07fbce4584' 
  AND token = 'j5qiQvVT9XkVF3yzv5S9n5qF0KXzbrfe6MWgHO7fhis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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