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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '493f33115b3caaaeef9d43fd99b00ff500e0bbd8c32d6ffc0bfe6d231fd50cb9' 
  AND token = 'PAMgzCxM0wvdWPx53yVRXUsGyBVAVeTOb7if8UIa58k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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