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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c2764841db6a8da4fd6a7852655a8d5b7363cad01e8a19ae111ab03be98b325' 
  AND token = 'ZYKfvhX1ESDEkDS6MI2rOO1Vkjk4BxEqc3kPdsfKO98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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