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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5218396871eafadd593a0277f30b4a53d2893c896a1856199e765902027516e' 
  AND token = 'Im+cghqf5SeXcyKO9Xvv7FNlGgYyMyG65Hrk8M3vDds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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