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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9edfe0bd9f036a85e3cc4c4e907b975c17ad16a7737b0435b00c626267039603' 
  AND token = 'CsniC/apweScW1ITYDABQzm54dcIbG59ZNZPqG6u5Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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