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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '073c367a7ef595d26a444862469239cde53e92df0b4a04f8a58235708862f544' 
  AND token = 'N0DyigIPsBWMmBM3pc5OI6pMo9Fhf9yyzhqPWEJWXqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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