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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c5a4e14cdfbd6e31b11093736e198730d649a4c918776c2580fead4e0c26f3' 
  AND token = 'XJwaBIX+o8XyvyOpIa4Rcb9IBCZHyaY2zDk3Hwncejk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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