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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '811941cba1ede941b57db8b15b0eec1119ed8324c4206870ab478d3c9ac5eaa9' 
  AND token = 'yNDGeSOQ87FDUldaiMfE9vbwnS8Kzm40jTUvK4qAbcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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