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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c09f8fcd5bcad51d12cdb8340f99f218a599e9052783f7c596f3f56306d71f96' 
  AND token = 'PE1kH0+JhwLJs0k8XDfNIc05ShK6pHjZpN1b+Ezj5Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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