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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d26fe993423ead7f21a14c5dc978ce1957ff1707f0779ccbc11fb2e88db05b7' 
  AND token = 'g3AZlPbaSRm/6Ui6I3trd0V27QxUjgbcc8ZKnPsiUtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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