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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd2c525ed862066e78c92c72f4c17cbdbb0060420fb1fb692b821eede6dc083' 
  AND token = '4oF7p245ZiRs+CXoUjlMDkm6kxrdbv34TJZF+OKEPVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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