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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd470c6db2f0e65a9842f34fdd840317ecd2a6ecbc97ddd39116915546a84e2af' 
  AND token = 'a0zGeScbJ/bFLasFBLI48bO3oq1zuMaVq0uACtLERU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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