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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8473c1d80235b471d72cd8aae88c79b10ad43795b425654cedc3df69bb748854' 
  AND token = '1DG/sGUpwfZBq8Dvi4XXb5FjpQWTcVOlt0RBDx17j3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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