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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17a72889854b92d5ed928f0bf8d93d59f52740c304b72b5d7a8f98d48f3953c6' 
  AND token = 'l9KxIKv+6t8srkpSS9cnWL3+opbEpd87/NCBc07aG+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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