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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d0d11a8a5cc4f3dd04f523888663b313c41e0a66f69088859063ea98324cd2' 
  AND token = 'j+c79HCoubWbM5cXm5ej8m8v5RatWxRtYcsvB9LgN9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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