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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d9ac3a5111b8d8635c3fe0f6c748042a977d2321070e5b4632b2a27b19a7c8' 
  AND token = 'QNK86J8iax8AxcvXyyURUGnToQemdM0alTaF9zRU6WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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