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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe0d561ec5306b6a851f4a9877de4da70484377392b40d66488c7ea444aaf5cb' 
  AND token = 'A3J3ar9sWBuHPy+3am5huaNuTvKgsjVgVV5IUlyEUlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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