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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e253fead50918fa4268c3fce2817d5d233f052ba615b6f3a17cd9fb052a706' 
  AND token = 'k0uoH6PgeB+fr7IaQmD1UQ4yYQC7YZxAcH7SCr71VG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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