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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ed0db8531e80923b019128fcdf118b7718b3af573acc2ddf4f65f41d41f0c55' 
  AND token = 'bN8tYMWEJV9miCQqlFkgAbJ15G9884rjs4HJ2SbgGCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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