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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d6df4c04058ee33a0c3e67c0c884fb7df4e69ec0275d33021985e8fcefad44c' 
  AND token = 'TBl7IsiW1SrBp2kKbuLvyTC9kz8DOGqVXd97OnPnU+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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