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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67aa2caaf340c96425c15bcd9be926185549168ab0e1aab10720f15d0d19d825' 
  AND token = 'q2n2fWC1748JY5V0TW57clXvZWBbIRCo1toW8aFER64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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