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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '017fef3b53bc6e5ab1ce4cf703a596240b652f675746ed0934f7945b8ef03d73' 
  AND token = 'zwbrfAEJ2jsvjifcyt7lRZvcCcd+0bLICSO3b6xd85E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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