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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9605b8f59fec3726cd8946b60e014f985dd27f7a174a95ec3c4387554449ab1b' 
  AND token = 'IaNChZ3mu1HR0AruDlCiJOMuK3+q8lQgIiTsD8QgVRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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