SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c1879f7520b1cc849f086ab08115a3782631f8416cd78d4931413a0d9d0b22' 
  AND token = 'Uqzr/4o+BPXvWYldgAuc3uloW9PJ/W6RinlLKhhBLk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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