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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cad5c8ffb7660e8186fde0ea24cd6a8901c045befb6bd35b30849e1512d1f95' 
  AND token = 'lHbGr1jkpq1Shm++sxGiXr6wn/po1t+DrZar4SMj/o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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