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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ed25da7e3544b9c2842bf8a6242699c615584be9326ab84f9dbe0cc70e3337' 
  AND token = 'kxsJngcrlGD0IO75DiXR20hBW8WI7k7zB+3NtrP/n5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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