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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab6968a482ac2baaf9ab383a064e18f00940c799fcb1ea476d1163aa5a961cb' 
  AND token = '8bufwXOWBruwmKwQa9y8Q649qniD7/Qd45+3s5azazk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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