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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e65594c58441af4469822a296d6ffbabaeada0d28024dfe3867a0d446d4bb07c' 
  AND token = '4j2NgDBp+LD/mL++Q5vEl6NOf06/1kuCQn8b2Pvms4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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