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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30408d2cc48f931c4a7a8c83f15ac4e240191613affcbd2b474bd3ac603106b6' 
  AND token = 'pncJFJVUNy/+XjOjlcaQMjhKceao5Vj0zQBbSQde0YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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