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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd50505625a63c53ee4f7474d1f22bdf559a9cd11a6d7e14175ab51ac119b3f8b' 
  AND token = '702S5a64SB+srPju+UY5uglWnGGy8Q0r5dfrKeCVdZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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