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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '358e19306297323122efe7b7c870ec8f061f3cc20759f8fc03ba89b32e8b7afb' 
  AND token = 'B3g2MqODOSs2dRXdWk5AKolCoTJwjeELyJlog6oqyC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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