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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc5233fa85020d6a43190f1ffaa8f3ccf086c6ffd3da4230229cdca2a9b5177b' 
  AND token = 'c827hEl4bo5Gx7u4XeVHhrZ5YIQzQkh/XdlnARmxZ6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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