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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093101e5d419894486c313c1310c0008d34e2d35aef15d8caca156c92c9af189' 
  AND token = 'Hf+eZWx/eO4s2JyMDjjCQRjTvrqj8gyb7vCaK9GDg+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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